[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/animation/CSSValueInterpolationType.cpp

Index: Source/core/animation/CSSValueInterpolationType.cpp
diff --git a/Source/core/animation/CSSValueInterpolationType.cpp b/Source/core/animation/CSSValueInterpolationType.cpp
index 7b91a827e17e77174a16d04bc0cdbdd6820db002..be09caa7ced635c056c45f687d37f16797d194b7 100644
--- a/Source/core/animation/CSSValueInterpolationType.cpp
+++ b/Source/core/animation/CSSValueInterpolationType.cpp
@@ -12,9 +12,9 @@ namespace blink {
 class CSSValueNonInterpolableValue : public NonInterpolableValue {
 public:
     ~CSSValueNonInterpolableValue() override { }
-    static PassRefPtrWillBeRawPtr<CSSValueNonInterpolableValue> create(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
+    static CSSValueNonInterpolableValue* create(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
     {
-        return adoptRefWillBeNoop(new CSSValueNonInterpolableValue(cssValue));
+        return new CSSValueNonInterpolableValue(cssValue);
     }
 
     CSSValue* cssValue() const { return m_cssValue.get(); }
@@ -38,7 +38,7 @@ private:
 DEFINE_NON_INTERPOLABLE_VALUE_TYPE(CSSValueNonInterpolableValue);
 DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(CSSValueNonInterpolableValue);
 
-PassOwnPtrWillBeRawPtr<InterpolationValue> CSSValueInterpolationType::maybeConvertSingle(const CSSPropertySpecificKeyframe& keyframe, const StyleResolverState*, ConversionCheckers&) const
+InterpolationValue* CSSValueInterpolationType::maybeConvertSingle(const CSSPropertySpecificKeyframe& keyframe, const StyleResolverState*, ConversionCheckers&) const
 {
     return InterpolationValue::create(*this, InterpolableList::create(0), CSSValueNonInterpolableValue::create(keyframe.value()));
 }